Skip the auto shop - Our mechanics make house calls

Q: Replaced the transmission with a 04 tranny and it shifts funny when I I'm coming to a stop. It's like a straight shift sometimes

asked by on

Changed trannys put a 05 trans in it an it shifts but it don't gear itself down like it should. An don't seem to have power like the other tranny I put the natural safety switch off my o2 on it case the plug wasn't the same on the o5 granny on the neutral safety switch could this be my problem.

My car has 190000 miles.
My car has an automatic transmission.

A: Hi there. The problem is the generation of ...

Hi there. The problem is the generation of the transmission is different, meaning the wiring harness inside the transmission is different. However, the range selector will not cause the transmission to not shift to the lower gears. The newer version of the transmission is designed to downshift when under throttle conditions and not under speed conditions.

GM has designed their new transmissions like this because drivers were complaining that the vehicle will jerk around as the transmission down shifted. The transmission will down shift back to 1st gear when the vehicle is at 5 mph or less. The other times when the vehicle is slowed down, when the driver demands more throttle, the transmission will downshift to allow the transmission to apply torque. There is nothing wrong with the transmission. If you have an issue with the transmission shifting manually, then replace the range selector. If you need further assistance diagnosing your vehicle’s shifting problem, then seek out a professional, such as one from YourMechanic, to help resolve this problem.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car hesitates and then jerks to go into first gear

Hi, thanks for writing in. There is a - Technical Service Bulletin regarding problems with the transmission control module and harsh shifting such as you are experiencing (TSB # 303773). Check with your Chevrolet service department to discuss how this...

Q: my car shaks after adding oil

Hi there: It's highly unlikely that the addition of oil or gasoline triggered the engine shaking situation you're experiencing now; unless he mistakenly added diesel fuel to a gasoline powered engine. It might be a good idea to have a...

Q: Creaking noise upon releasing the clutch

Hello. This is usually caused by either a worn out engine or transmission mount or an issue with a worn out suspension bushing. Either one will allow parts to move when they should be stationary and will cause this noise...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...